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Definitions from the Web

Membranous Sac

Noun

A membranous sac refers to a small, thin-walled structure enclosed by a layer of membrane.

Example sentence: The fetus develops inside the membranous sac called the amniotic sac.

Adjective

In an adjective sense, membranous sac describes something that possesses the characteristics of a sac, with a thin, membrane-like structure.

Example sentence: The membranous sac surrounding the spinal cord provides protection and cushioning.

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